Answer to Question #96651 in Molecular Physics | Thermodynamics for Abdulhamil J. Bangcola

Question

If evaporation is a cooling process qnd boiling is a rapid evaporation, is it accurate to say that boiling is a rapid cooñing process? Explain.

Answer 1

Evaporation causes cooling because the process requires heat energy. The energy is taken away by the molecules when they convert from liquid into gas, and this causes cooling on the original surface.

Boiling is a bulk phenomenon, in the sense that it occurs throughout the liquid. Conversely, evaporation is surface phenomena, which take place only on the surface of the liquid. Boiling of a liquid occurs only at the boiling point of that liquid, i.e. it takes place only at a definite temperature.

In boiling the substance is converted to water vapor at its boiling point but in evaporation substance is converted to vapour before its boiling point. Evaporation is the process of conversion of a liquid into vapor at a temperature below its boiling point.